from django.contrib.auth import login,authenticate,logout
from django.shortcuts import render,redirect
from django.views import View
from django import http
import re,json,logging
from django.urls import reverse
from django.db import DatabaseError
from django_redis import get_redis_connection
from django.contrib.auth.mixins import LoginRequiredMixin

from users.models import User,Address
from meiduo_mall.utils.response_code import RETCODE
from meiduo_mall.utils.views import LoginRequiredJSONMixin
from celery_tasks.email.tasks import send_verify_email
from users.utils import generate_verify_email_url,check_verify_email_token
from . import constants
from goods.models import SKU
from carts.utils import merge_carts_cookies_redis
# Create your views here.


# 创建日志输出器
logger = logging.getLogger('django')

class UserBrowseHistory(LoginRequiredJSONMixin, View):
    """用户浏览记录"""
    def post(self,request):
        """保存用户商品浏览记录"""
        # 接收参数
        json_str = request.body.decode()
        json_dict = json.loads(json_str)
        sku_id = json_dict.get('sku_id')

        # 校验参数
        try:
            SKU.objects.get(id=sku_id)
        except SKU.DoesNotExist:
            return http.HttpResponseForbidden('参数sku_id 错误')

        # 保存sku_id到redis
        redis_conn = get_redis_connection('history')
        user = request.user

        pl = redis_conn.pipeline()
        # 先去重
        pl.lrem('history_%s' % user.id, 0, sku_id)
        # 再保存: 最近浏览的商品在最前面
        pl.lpush('history_%s' % user.id, sku_id)
        # 最后截取
        pl.ltrim('history_%s' % user.id, 0, 4)
        # 执行
        pl.execute()

        # 响应结果
        return http.JsonResponse({'code':RETCODE.OK, 'errmsg':'ok'})

    def get(self,request):
        """查询用户商品浏览记录"""

        # 获取登陆用户信息
        user = request.user

        # 创建链接到redis对象
        redis_conn = get_redis_connection('history')
        # 取出列表数据(核心)
        sku_ids = redis_conn.lrange('history_%s' % user.id, 0, -1) #(0, 4)也可以

        # 将模型转字典
        skus = []
        for sku_id in sku_ids:
            sku = SKU.objects.get(id=sku_id)
            skus.append({
                'id': sku.id,
                'name': sku.name,
                'price': sku.price,
                'default_image_url': sku.default_image.url
            })

        return http.JsonResponse({'code':RETCODE.OK,'errmsg':'ok','skus': skus})



class ChangePasswordView(LoginRequiredMixin,View):
    """修改密码"""
    def get(self,request):
        """提供修改密码页面"""
        return render(request,'user_center_pass.html')

    def post(self,request):
        """实现修改密码的业务逻辑"""

        # 接收参数
        old_password = request.POST.get('old_password')
        new_password = request.POST.get('new_password')
        new_password2 = request.POST.get('new_password2')

        # 校验参数
        if not all([old_password,new_password,new_password2]):
            return http.HttpResponseForbidden('缺少必传参数')
        try:
            request.user.check_password(old_password)
        except Exception as e:
            logger.error(e)
            return render(request,'user_center_pass.html', {'origin_password_errmsg':'原始密码错误,请重新输入'})

        if not re.match(r'^[0-9A-Za-z]{8,20}$',new_password):
            return http.HttpResponseForbidden('密码格式不正确,请输入8-20位字符')

        if old_password==new_password:
            return http.HttpResponseForbidden('新旧密码输入一致,须重新输入')

        if new_password != new_password2:
            return http.HttpResponseForbidden('两次输入密码不一致')


        #修改密码
        try:
            request.user.set_password(new_password)
            request.user.save()
        except Exception as e:
            logger.error(e)
            return render(request,'user_center_pass.html', {'change_password_errmsg':'密码修改失败'})

        # 状态保持清除
        logout(request)
        response = redirect(reverse('users:login'))
        response.delete_cookie('username')
        return response


class UpdateTitleAddressView(LoginRequiredJSONMixin,View):
    """更新(修改)地址的标题"""

    def put(self,request, address_id):
        """实现更新地址标题的逻辑"""

        # 接收参数: title
        json_dict = json.loads(request.body.decode())
        title = json_dict.get('title')

        # 校验参数
        if not title:
            return http.HttpResponseForbidden('缺少标题信息title')

        try:
            # 查询当前要更新地址的标题信息
            address = Address.objects.get(id=address_id)
            # 将新的地址标题覆盖地址标题
            address.title = title
            address.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code':RETCODE.DBERR, 'errmsg':'标题设置失败'})

        # 响应结果
        return http.JsonResponse({'code':RETCODE.DBERR, 'errmsg':'标题设置成功'})



class DefaultAddressView(LoginRequiredJSONMixin,View):
    """设置默认地址"""
    def put(self,request,address_id):
        """实现设置默认地址逻辑"""
        try:
            # 查询出当前哪个地址会作为登录用户的默认地址
            address = Address.objects.get(id = address_id)

            # 将指定的地址设置为当前登录用户的默认地址
            request.user.default_address = address
            request.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code':RETCODE.DBERR,'errmsg':'设置默认地址失败'})

        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '设置默认地址成功'})






class UpdateDestoryAddressView(LoginRequiredJSONMixin ,View):
    """更新和删除地址"""
    def put(self,request,address_id):
        """更新地址"""

        # 接收参数
        json_dict = json.loads(request.body.decode())
        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')

        # 校验参数
        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')

        # 使用最新的地址信息,覆盖指定的旧地址信息

        # save()方法----代码太多------
        # address = Address.objects.get(id=address_id)
        # address.title = ''
        # address.user = ''
        # address.save()
        #----------------------------
        try:
            # 返回的是受影响的行数
            Address.objects.filter(id=address_id).update(
                user = request.user,
                title = receiver,
                receiver = receiver,
                province_id = province_id,
                city_id = city_id,
                district_id = district_id,
                place = place,
                mobile = mobile,
                tel = tel,
                email = email
            )
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '修改地址失败'})



        # 响应新的地址信息,给前端进行渲染到页面
        address = Address.objects.get(id=address_id)
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }

        return http.JsonResponse({'code':RETCODE.OK, 'errmsg':'修改地址成功', 'address':address_dict})

    def delete(self, request, address_id):
        """删除地址"""
        # 实现指定地址的逻辑删除: is_delete = True
        try:
            address = Address.objects.get(id=address_id)
            address.is_deleted = True
            address.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code':RETCODE.DBERR,'errmsg':'删除地址失败'})

        # 响应结果: code 和 errmsg
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '删除地址成功'})




class AddressCreateView(LoginRequiredJSONMixin ,View):
    """新增地址"""
    def post(self,request):
        """实现新增地址逻辑 """

        # 判断用户地址数量是否超过上限: 查询当前登录用户收货地址数量
        # count = Address.objects.filter(user = request.user).count() 条件查询
        count = request.user.addresses.count()  # 一查多  使用related_name 查询
        if count > constants.USER_ADDRESS_COUNTS_LIMIT:
            return http.JsonResponse({'code':RETCODE.THROTTLINGERR,'errmsg':'超出用户地址保存上限'})


        # 接收参数
        json_str = request.body.decode()
        json_dict = json.loads(json_str)
        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')
        # 校验参数
        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')


        # 保存用户传入的地址信息
        try:
            address = Address.objects.create(
                            user = request.user,
                            title = receiver, # 标题就是收货人信息
                            receiver = receiver,
                            province_id = province_id,
                            city_id = city_id,
                            district_id = district_id,
                            place = place,
                            mobile = mobile,
                            tel = tel,
                            email = email,
                        )

            # 如果当前登录用户没有默认的地址,我们需要指定默认的地址
            if not request.user.default_address:
                request.user.default_address = address
                request.user.save()

        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code':RETCODE.DBERR, 'errmsg':'新增地址失败'})

        # 构造响应数据
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }

        # 响应新增地址结果: 需要将新增的地址返回给前端渲染到页面
        return http.JsonResponse({'code':RETCODE.OK, 'errmsg':'新增地址成功', 'address':address_dict})




class AddressView(LoginRequiredJSONMixin,View):
    """用户收货地址"""
    def get(self,request):
        """查询并展示用户的收货地址"""

        # 获取当前登录用户对象
        login_user = request.user

        # 使用当前登录用户和is_deleted=False作为条件查询地址数据
        addresses = Address.objects.filter(user=login_user, is_deleted=False)

        # 将用户地址模型列表转字典列表: 因为Vue.js 不认识 模型类型, 只有jiango和 Jinja2模板引擎认识
        address_list = []
        for address in addresses:
            address_dict = {
                 "id": address.id,
                "title": address.title,
                "receiver": address.receiver,
                "province": address.province.name,
                "city": address.city.name,
                "district": address.district.name,
                "place": address.place,
                "mobile": address.mobile,
                "tel": address.tel,
                "email": address.email
            }
            address_list.append(address_dict)

        # 构造上下文
        context = {
            'default_address_id': login_user.default_address_id,
            'addresses': address_list
        }

        return render(request,'user_center_site.html',context)


class VerifyEmailView(View):
    """验证邮箱激活码"""
    def get(self,request):
        # 接收参数
        token = request.GET.get('token')
        # 校验参数
        if not token:
            return http.HttpResponseForbidden('缺少token')
        # 从token中提取用户信息 user_id ==> user
        user = check_verify_email_token(token)
        if not user:
            return http.HttpResponseBadRequest('无效的token')

        # 将用户的email_active字段设置为True
        try:
            user.email_active = True
            user.save()
        except Exception as e:
            logger.error(e)
            return http.HttpResponseServerError('激活邮箱失败')
        # 响应结果: 重定向到用户中心
        return redirect(reverse('users:info'))



class EmailView(LoginRequiredJSONMixin,View):
    """添加邮箱"""
    def put(self,request):
        # 接收参数
        # body 类型是bytes  需要转为str
        json_str = request.body.decode()
        json_dict = json.loads(json_str)
        email = json_dict.get('email')

        # 校验参数
        if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
            return http.HttpResponseForbidden('参数email有误')

        # 将用户传入的邮箱保存到用户数据库的email字段中
        try:
            request.user.email = email
            request.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code':RETCODE.DBERR,'errmsg':'添加邮箱失败'})


        # 发送邮箱验证邮件
        verify_url = generate_verify_email_url(request.user)
        # 调用celery定义的方法 一定要记得加 .delay
        send_verify_email.delay(email,verify_url)


        # 响应结果
        return http.JsonResponse({'code':RETCODE.OK,'errmsg':'OK'})




class UserInfoView(LoginRequiredMixin,View):
    """用户中心"""
    def get(self,request):
        """提供用户中心页面"""
        # 判断用户是否登录(太粗糙版本)-----------------------------------
        # if request.user.is_authenticated:
        #     return render(request,'user_center_info.html')
        # else:
        #     return redirect(reverse('users:login'))
        # login_url = '' 如果不传值 则跳转到 setting.LOGIN_URL
        # redirect_field_name = '' 不传值 则为‘next' 即哪来回哪
        # ----------------------------------------------------------
        # 如果LoginRequiredMixin判断出用户已登录,那么request.user就是登录用户对象
        context = {
            'username':request.user.username,
            'mobile':request.user.mobile,
            'email':request.user.email,
            'email_active':request.user.email_active,
        }

        return render(request, 'user_center_info.html',context)


class LogoutView(View):
    """用户退出登录"""
    def get(self,request):
        """实现用户退出登录逻辑实现"""

        # 清除状态保持信息
        logout(request)

        # 退出登录后重定向到首页
        response = redirect(reverse('contents:index'))

        # 删除cookies中的用户名
        response.delete_cookie('username')

        # 响应结果
        return  response


class LoginView(View):
    """用户登录"""
    def get(self,request):
        """提供用户登录页面"""
        return render(request,'login.html')

    def post(self,request):
        """实现用户登录逻辑"""
        # 接收参数
        username =request.POST.get('username')
        password =request.POST.get('password')
        remembered =request.POST.get('remembered')

        # 校验参数
        if not all([username,password]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return http.HttpResponseForbidden('请输入正确的用户名或手机号')
        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return http.HttpResponseForbidden('密码最少8位，最长20位')

        # 认证用户：使用帐号查询用户是否存在，如果存在，再校验密码是否正确
        user = authenticate(username=username,password=password)
        if user is None:
            return render(request, 'login.html',{'account_errmsg':'帐号或密码错误'})

        # 状态保持
        login(request, user)
        # 使用remembered确定状态保持周期（实现记住登录）
        if remembered != 'on':
            # 没有记住登录：状态保持在浏览器会话结束后就销毁（单位是秒）
            request.session.set_expiry(0)
        else:
            # 记住登录： 状态保持周期（单位是秒）为两周:默认是两周
            request.session.set_expiry(None)

        # 响应结果：重定向到首页
        # 先取出next
        next = request.GET.get('next')
        if next:
            # 存在 重定向到next
            response = redirect(next)
        else:
            # 不存在 重定向到首页
            response = redirect(reverse('contents:index'))

        # 为了实现再首页右上角展示用户信息，需要将用户名缓存到cookie中、
        # response.set_cookie('key','value','expiry')
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)


        # 用户登陆成功, 合并cookie购物车到redis购物车
        response = merge_carts_cookies_redis(request=request, user=user, response=response)



        # 返回结果:重定向到首页
        return response



class UsernameCountView(View):
    """判断用户名是否重复注册"""
    def get(self, request, username):
        """
        :param username: 用户名
        :return: JSON
        """
        # 接收和校验参数 （已通过路由中的正则接收校验完成,数据传输至username）
        # 实现主体业务逻辑： 使用username 查询mysql数据库对应记录的条数(filter返回的是满足条件的结果集)
        count = User.objects.filter(username=username).count()
        # 响应结果
        return http.JsonResponse({'code':RETCODE.OK,'errmsg':'OK','count':count})

class MobileCountView(View):
    """判断手机号是否重复注册"""
    def get(self,request,mobile):

        count = User.objects.filter(mobile=mobile).count()
        return http.JsonResponse({'code':RETCODE.OK,'errmsg':'OK','count':count})


class RegisterView(View):
    """用户注册"""
    def get(self,request):
        """提供注册页面"""
        return  render(request,'register.html')

    def post(self,request):
        """实现用户注册业务逻辑"""
        # 接收参数： 表单参数
        username = request.POST.get('username')
        password = request.POST.get('password')
        password2 = request.POST.get('password2')
        mobile = request.POST.get('mobile')
        sms_code_client = request.POST.get('sms_code')
        allow = request.POST.get('allow')

        # 校验参数: 后端再次校验 前后端校验分开 避免恶意用户越过前端逻辑发请求，保证后端安全，前后端逻辑相同
        # 判断参数是否齐全: all([])： 会校验列表中的元素是否为空，只要有一个为空，返回false
        if not all([username,password,password2,mobile,allow]):
            return http.HttpResponseForbidden('如果缺少必传参数，响应错误提示信息，403')

        # 判断用户名是否是5-20个字符
        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return http.HttpResponseForbidden('请输入5-20个字符的用户名')

        # 判断密码是否是8-20位字符
        if not re.match(r'^[0-9A-Za-z]{8,20}$',password):
            return http.HttpResponseForbidden('请输入8-20位密码')

        # 判断两次输入的密码是否一致
        if password != password2:
            return http.HttpResponseForbidden('两次输入密码不一致')
        # 判断手机号是否合法
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('请输入正确的手机号')
        # 判断短信验证码是否输入正确
        redis_conn = get_redis_connection('verify_code')
        sms_code_server = redis_conn.get('sms_%s' % mobile)
        if sms_code_server is None:
            return render(request,'register.html',{'sms_code_errmsg':'短信验证码已失效'})
        if sms_code_client != sms_code_server.decode():
            return render(request,'register.html',{'sms_code_errmsg':'短信验证码输入错误'})


        # 判断用户是否勾选协议
        if allow != 'on':
            return http.HttpResponseForbidden('请勾选用户协议')


        # 保存注册数据： 注册业务核心
        try:
            user = User.objects.create_user(username=username, password=password, mobile=mobile)
        # 查询错位原因 except Exception as e:
        # 后台打印错误 print(e)
        except DatabaseError:
            return render(request,'register.html',{'register_errmsg':'注册失败'})

        # 实现状态保持
        login(request,user)

        # 响应结果：重定向到首页
        response = redirect(reverse('contents:index'))

        # 为了实现再首页右上角展示用户信息，需要将用户名缓存到cookie中、
        # response.set_cookie('key','value','expiry')
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)

        # 返回结果:重定向到首页
        return response

        # # 响应结果 重定向到首页
        # # return http.HttpResponse('注册成功，重定向到首页')
        # # return redirect('/')
        # # reverse('contents:index') == '/'
        # return redirect(reverse('contents:index'))